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Microsoft warns of ransomware attacks as Exchange hack escalates


Security program manager Philip Misner reported on Thursday that Exchange users now also need to watch out for “human-operated ransomware attacks”, with the threat to customers escalating as a result.
Microsoft observed a new family of human operated ransomware attack customers – detected as Ransom:Win32/DoejoCrypt.A. Human operated ransomware attacks are utilizing the Microsoft Exchange vulnerabilities to exploit customers. #DearCry@MsftSecIntel Phillip Misner (@phillip misner) March 12, 2021
The ransomware, also known as DearCry, is typical in its approach, preventing users from being able to use their PCs or access their data until a payment is sent to hackers, according to information outlined by Microsoft. ....

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Dearcry Ransomware Targets Unpatched Exchange Servers


Source: Microsoft, Bleeping Computer
Ransomware-wielding attackers have begun to exploit a serious proxy-logon flaw in unpatched versions of Microsoft Exchange running on premises, Microsoft reports. Hackers have exploited the flaw to access vulnerable servers, crypto-lock files and demand a ransom from victims in return for the promise of a decryption tool.
News of the attack campaign follows Microsoft on March 2 issuing emergency patches to fix four zero-day flaws in Microsoft Exchange, which is one of the most widely used pieces of IT infrastructure in the world.
Because we are aware of active exploits of related vulnerabilities in the wild, Microsoft said in its March 2021 Exchange Server Security Updates alert, which it continues to update, our recommendation is to install these updates immediately to protect against these attacks. ....

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Ransomware Operators Start Targeting Microsoft Exchange Vulnerabilities


By Ionut Arghire on March 12, 2021
In addition to state-sponsored threat actors, the recently disclosed vulnerabilities affecting Microsoft Exchange Server are now being targeted by ransomware operators.
A total of four critical zero-day vulnerabilities that are collectively referred to as ProxyLogon were patched in Exchange Server at the beginning of this month, and activity surrounding the bugs has only intensified since.
This week, ESET revealed that it has identified at least 10 threat actors that are attempting to exploit these vulnerabilities in their attacks, including Calypso, LuckyMouse (also tracked as APT27), Mikroceen, ShadowPad, Tick (also known as Bronze Butler), Tonto Team (CactusPete), Websiic, Winnti Group (BARIUM, APT41), and DLTMiner. ....

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